I searched over the Internet I found out that hardware acceleration might be disabled. That was indeed the case - GPU accelerated was turned off but also disabled.
I searched around more and found out that I had to compile my system with the vaapi flag. I did so, but found out that I had to set "nvidia" in VIDEO_CARDS, however, I'm using nouveau.
Anyways, I set "nouveau nvidia", re-emerged world and enabled GPU acceleration, but still no luck...